Melatonin for sleep: how much, what time and when you don't need it

In September, sleep goes off track. The holidays end, the usual schedule returns, it gets dark earlier and the body takes a few days to reset its clock. It is the time of year when most people buy melatonin, and also when most people buy it badly: the 10-milligram bottle, taken at any old time, in the hope that it will work like a sleeping pill.

Melatonin is not a sleeping pill. It is a time signal: it tells the body that night has arrived. That is why the time you take it matters more than the dose, and why the effect measured in trials is far more modest than the label suggests. Here is how much to take, when, what the evidence says in minutes, and when you do not need it at all.

In short

• The authorised EU health claim is based on 1 mg taken shortly before bedtime: "Melatonin contributes to the reduction of time taken to fall asleep".
• The reference meta-analysis, with 19 trials and 1,683 participants, found that people fall asleep 7 minutes sooner and sleep 8 minutes longer. It is real, it is small, and it is worth knowing before you buy.
• In Spain the legal limit in food supplements is 2 mg a day. Above that amount, the Spanish medicines agency (AEMPS) classes it as a medicine, not a supplement. The 5 and 10 mg bottles sold on foreign websites are not legal here as supplements.
• The American Academy of Sleep Medicine advises against melatonin for chronic insomnia in adults. It makes more sense for jet lag and delayed sleep timing.
• Timing rules. Half an hour to an hour before bed, with the lights low. Taken at the wrong time, it can shift your clock in the opposite direction.
• Sleepmaxxing —the obsession with optimising every sleep metric— has a documented side effect: orthosomnia, anxiety about the data that worsens the very insomnia it was meant to fix.
• What moves the needle most cannot be bought: morning light, a steady bedtime, no caffeine late in the day and a dinner that does not sit like a brick.

What melatonin really does, and what it doesn't

Melatonin is a hormone that the pineal gland releases as light fades. It does not induce sleep through sedation, as a hypnotic drug does: it tells the brain where it is in the 24-hour cycle. That is why its clearest and best-documented effect is not "sleeping more" but shifting the internal clock, which is exactly the problem in September, with night shifts and after a long-haul flight.

This distinction is not academic: it changes what you can expect from it. If you cannot sleep because your clock has drifted —you go to bed at two, get up at ten, and now you have to start work at eight—, melatonin makes sense. If you cannot sleep because you wake at four in the morning with your mind racing, the problem is a different one and melatonin is not the tool: we cover that in our article on chronic stress and the nervous system.

The evidence, measured in minutes

The most cited meta-analysis on melatonin and primary sleep disorders pooled 19 randomised placebo-controlled trials with 1,683 participants. The results, in concrete figures:

• Sleep onset latency (how long it takes you to fall asleep): 7.06 minutes less than with placebo (95% CI: 4.37 to 9.75).
• Total sleep time: 8.25 minutes more (95% CI: 1.74 to 14.75).
• Sleep quality: a significant but modest improvement, with a standardised mean difference of 0.22.

The authors say it plainly: these improvements are smaller than those of insomnia medicines, and what makes melatonin worth considering is its good safety profile and the fact that it causes little dependence. That is the honest case for selling it: not that it does a lot, but that it does little harm.

A caveat almost nobody mentions, and one that goes against the usual message: in that same meta-analysis, higher doses and longer treatments did produce somewhat more effect on latency and duration, though not on quality. The reason to stay with low doses in Spain is not that high doses do nothing; it is that above 2 mg a day it stops being a food supplement and becomes a medicine according to the AEMPS. That is the legal framework, and it is better to say so than to invent a physiological justification.

Five rules for taking it properly

1. The dose in the authorised claim is 1 mg

This is the amount per serving that EU law requires in order to claim it helps you fall asleep. For jet lag, the authorised claim —"Melatonin contributes to the alleviation of subjective feelings of jet lag"— requires at least 0.5 mg, taken close to bedtime on the first day of travel and on the following days. In nervous system you will find Kal 1 mg melatonin, which is exactly the dose in the claim, and Naturitas 1.95 mg, which sits just under the legal maximum.

2. Timing matters more than milligrams

Take it 30 to 60 minutes before bed, with the lights at home already low. Taking it and then spending two hours with your phone in your face cancels out much of what you paid for, because light suppresses the signal you have just reinforced. If you are travelling, the reference is bedtime at your destination, not at home. Melatonin drops let you adjust the amount more precisely than a tablet cut in half.

3. In Spain the ceiling is 2 mg

Since 2013, the Spanish food safety agency (AESAN) has set the limit for melatonin in food supplements at 2 mg a day, and the AEMPS classes any product above that as a medicine. If you see a 5 or 10 mg bottle on a foreign website, it is not stronger: it simply does not follow Spanish rules. And products have been withdrawn before.

4. Try it for two weeks and decide

Start with the lowest dose you can find, give it two straight weeks and observe. If nothing has changed, stop: the meta-analysis talks about minutes, not hours, and some people do not respond. Doubling the dose is not the conclusion the data support, and in Spain you have little legal room to go much higher anyway.

5. What really moves the needle cannot be bought

Natural light in the first hour of the day is what truly anchors the clock. A steady bedtime, weekends included. No caffeine after mid-afternoon: if that is hard, coffee and herbal teas has decaf and caffeine-free rooibos. And a dinner that is not a heavy digestion —an early plate of legumes works better than an ultra-processed meal at eleven—. If you are short of quick dinner ideas, look at jarred legumes and seasonal vegetables.

Sleepmaxxing: when optimising sleep keeps you awake

Sleepmaxxing is the trend of chasing perfect rest by piling up rules: supplements, rings and wristbands that score your night, temperature and light control, mouth tape to force nasal breathing. Part of it is good old sleep hygiene, and that is fine. The problem is the accumulation and the pressure to get a good score every night.

It has a clinical name: orthosomnia, an excessive preoccupation with achieving perfect sleep metrics, which creates hypervigilance and frustration and ends up worsening the insomnia it was meant to fix. A 2026 study published in Frontiers in Psychology found that people with pre-existing insomnia report the most negative effects from using sleep-tracking apps —precisely the people who, in theory, need them most.

The practical takeaway: if you have been checking your sleep score every morning for a month and you feel worse than before, the experiment to run is to remove the tracker for two weeks. It costs nothing and it is the only item on this list that can give you a big change.

What else there is besides melatonin

Valerian

The most widely used plant for sleep in Europe and the one with the most trials, with inconsistent results across studies. It is worth trying when the problem is more about tension than about your clock. You will find Santiveri valerian in nervous system.

Passionflower

Passiflora incarnata, traditionally used for nervousness and restlessness before bed. It comes as tablets —Soria Natural passionflower— and also as an herbal tea, which for many people works better as a wind-down ritual than as an active ingredient.

Corn poppy

Corn poppy extract (Papaver rhoeas, the common field poppy, not the California poppy) is a classic in plants and extracts for rest. Be careful not to mix up common names: they are different plants with different research behind them.

L-theanine and lemon balm

L-theanine is the green tea amino acid associated with calm without drowsiness; combined with lemon balm, it is used to slow down at the end of the day. In our range there is the Viridian formula.

Magnesium

It is the most bought for sleep and the least understood. The form matters, and not all the forms sold for sleep have evidence behind them. We cover it in full in our post on bisglycinate, citrate and threonate; Sura Vitasan bisglycinate is the most popular choice for the evening.

What to take depending on the problem

Fourteen days to reset your September sleep

Without buying anything in the first week. It is the order that makes sense: free things first, and a supplement only if needed.

The shopping list

• Melatonin and night-time formulas: nervous system, where you will find melatonin, magnesium and combined formulas.
• Plants: plants and extracts for valerian, passionflower and corn poppy extract.
• Evening teas: coffee and herbal teas, with decaf, rooibos and lime blossom.
• Minerals: vitamins and minerals; note that magnesium lives in nervous system, not here.
• A light dinner: legumes, vegetables and seasonal fruit.
• Tryptophan from real food: nuts, yoghurt and dairy and superfoods.
• A screen-free ritual: lavender essential oils and night-time cosmetics in personal care.

Do you need supplements to sleep?

Almost never, and certainly not as a first step. The right order is the reverse of what nearly everyone does: first your wake-up time, morning light, caffeine and dinner; then, if the problem is a drifted clock, 1 mg of melatonin at the right time. A supplement does not make up for going to bed at a different time every day.

And there is one case where saying no is the right answer: if you have not slept well for months, this is not for you. The American Academy of Sleep Medicine advises against melatonin for chronic insomnia in adults, and what has the best evidence in that scenario is cognitive behavioural therapy for insomnia, which neither we nor anyone else sells in a bottle. If you also take anticoagulants, diabetes medication, immunosuppressants or anti-epileptics, are pregnant, or it is for a child, check with a professional first.

Nor does it make sense to stack four things at once. If you take melatonin, valerian, magnesium and a herbal tea on the same night and sleep better, you will not know what worked and you will keep paying for all four.

Where to buy melatonin and sleep herbs in Barcelona and Sant Cugat

In all three Linverd shops you can read the label before you buy, and with melatonin that is exactly what you need: check the milligrams per tablet and whether there is anything else in it. Many night-time formulas combine melatonin with tryptophan, valerian and vitamin B6, and then you are no longer comparing doses, you are comparing recipes. Melatonin gummies with tryptophan and valerian are the typical example: convenient, but with several actives at once. Being able to ask at the counter what you are holding is what a foreign website cannot give you.

• Linverd Provença — Provença 242, 08008 Barcelona (Eixample, between Balmes and Enric Granados).
• Linverd Còrsega — Còrsega 78, 08029 Barcelona (Eixample, near Sants station).
• Linverd Sant Cugat — Antoni Bell 2, 08174 Sant Cugat del Vallès (Volpelleres neighbourhood).

Phone: +34 683 118 961. Email: linverd@linverd.com. If you would rather not go out, the whole nervous system section is in the online shop, with delivery in Barcelona and the surrounding area, along with our evening teas.

Frequently asked questions

How much melatonin should you take for sleep?

The authorised EU health claim is based on 1 mg per serving, taken shortly before bedtime. In Spain, supplements cannot exceed 2 mg a day: above that amount the product is considered a medicine. Starting with the lowest dose and only increasing if needed is the sensible approach.

What time should you take melatonin?

Between 30 and 60 minutes before bed, with the lights at home already low. Timing matters more than dose, because melatonin works as a time signal, not as a sedative. When travelling, take it according to bedtime at your destination.

How much does melatonin really help?

A meta-analysis of 19 trials with 1,683 participants found that people fall asleep about 7 minutes sooner and sleep about 8 minutes longer than with placebo, with a modest improvement in quality. It is a real but small effect, smaller than that of insomnia medicines.

Can you take melatonin every night?

Its safety profile is good and it causes little dependence, but the American Academy of Sleep Medicine advises against using it for chronic insomnia in adults. If you have been taking it for weeks without noticing a difference, the sensible thing is to stop and review your schedule, light exposure and caffeine with a professional.

What are sleepmaxxing and orthosomnia?

Sleepmaxxing is the trend of optimising sleep by piling up rules, devices and supplements. Orthosomnia is its side effect: obsessing over metrics creates night-time anxiety and can worsen insomnia. People with pre-existing insomnia are the ones who cope worst with it.

Melatonin or valerian?

They are not for the same thing. Melatonin fits when the problem is a drifted clock: you go to bed late, you travel or you change shifts. Valerian and passionflower are used when the difficulty is winding down, with results that vary a lot from one person to another.

Where can I buy melatonin in Barcelona or Sant Cugat?

In the three Linverd Market shops: Provença 242 (08008 Barcelona), Còrsega 78 (08029 Barcelona) and Antoni Bell 2 (08174 Sant Cugat del Vallès). We stock 1 mg and 1.95 mg melatonin, drops, gummies and herbs such as valerian, passionflower and corn poppy. Phone +34 683 118 961.

The takeaway

Melatonin is a good tool for one specific problem —a drifted clock— and a mediocre tool for everything else. One milligram, half an hour to an hour before bed, lights low, and two weeks to decide. Before that, your wake-up time and morning light, which are free and do more. You will find the nervous system and plants and extracts sections in the online shop, and if you would rather see it and ask, we are at Provença 242 and Còrsega 78 in Barcelona and at Antoni Bell 2 in Sant Cugat.

Read on: Magnesium: bisglycinate, citrate or threonate, Chronic stress and the nervous system and How much fibre per day you need. And the whole health blog.

This information is for general guidance and does not replace advice from a healthcare professional. Melatonin is not recommended during pregnancy, breastfeeding or for children without supervision, and it may interact with anticoagulants, diabetes medication, immunosuppressants and anti-epileptics. If insomnia lasts for weeks, see a professional.